<template>
  <div id="box">
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片区域 -->
    <el-card>
      <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
      <!-- 步骤条区域 -->
      <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="结束"></el-step>
      </el-steps>
      <!-- tab区域 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
        <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClick">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price" type="number">
              <el-input v-model="addForm.goods_price"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight" type="number">
              <el-input v-model="addForm.goods_weight"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number" type="number">
              <el-input v-model="addForm.goods_number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader v-model="addForm.goods_cat" :options="cateList"
                         :props="cateProps" @change="handleChange" clearable>
              </el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单item项 -->
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cd" v-for="(cd, i) in item.attr_vals" :key="i" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- 
              action 是图片要上传到的后台api地址  on-preview 处理图片预览
              on-remove 移除图片  list-type 指定预览组件的呈现方式
             -->
            <el-upload :action="uploadURL" :on-remove="handleRemove"
                       :on-preview="handlePreview" list-type="picture" 
                       :headers="headerObj" :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>  
            <!-- 添加商品的按钮 -->
            <el-button type="primary" class="elButton" @click="btnAdd">添加商品</el-button>
          </el-tab-pane> 
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" class="priviewImg">
    </el-dialog>
  </div>
</template>

<script>
  // 导入Lodash工具库(使用里边的深拷贝函数)
  import _ from 'lodash'

  export default {
    name:'Add',
    data() {
      return {
        activeIndex:'0',
        //添加商品表单的数据对象
        addForm:{
          goods_name:'',
          goods_price:0,
          goods_weight:0,
          goods_number:0,
          //商品所在的分类数组
          goods_cat:[],
          //图片的数组
          pics:[],
          //商品详情描述
          goods_introduce:'',
          //商品的参数
          attrs:[]
        },
        //验证规则
        addFormRules:{
          goods_name:[
            {required:true,message:'请输入商品名称!',trigger:'blur'}
          ],
          goods_price:[
            {required:true,message:'请输入商品价格!',trigger:'blur'}
          ],
          goods_weight:[
            {required:true,message:'请输入商品重量!',trigger:'blur'}
          ],
          goods_number:[
            {required:true,message:'请输入商品数量!',trigger:'blur'}
          ],
          goods_cat:[
            {required:true,message:'请选择商品分类!',trigger:'blur'}
          ]
        },
        //商品分类列表
        cateList:[],
        cateProps:{
          expandTrigger: 'hover',
          //看到的属性
          label:'cat_name',
          //选中的属性
          value:'cat_id',
          //那个属性实现父子嵌套
          children:'children'
        },
        //动态参数列表数据
        manyTableData:[],
        //静态属性列表数据
        onlyTableData:[],
        //上传图片的URL地址
        uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
        //图片上传组件的请求头对象
        headerObj:{
          Authorization:window.sessionStorage.getItem('token')
        },
        //图片真实路径
        previewPath:'',
        //图片预览对话框的显示与隐藏
        previewVisible:false
      }
    },
    created() {
      this.getCateList()
    },
    methods: {
      //获取商品分类数据列表
      async getCateList() {
        const {data} = await this.$http.get('categories')
        if(data.meta.status !== 200) {
          return this.$message.error('获取商品失败!');
        }
        this.cateList = data.data
        // console.log(data.data);
      },
      //级联选择器发生变化触发该函数
      handleChange() {
        if(this.addForm.goods_cat.length !== 3) {
          this.addForm.goods_cat = []
        }
      },
      /* 
        处理标签页切换函数 activeName 即将进入的标签页
                          oldActiveName 即将离开的标签页
        切换标签之前的钩子，若返回 false，则阻止切换。
      */  
      beforeTabLeave(activeName, oldActiveName) {
        if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
          this.$message.error('请选择商品分类！')
          return false
        }
      },
      async tabClick() {
        //证明访问的是动态参数面板
        if(this.activeIndex === '1') {
          const {data} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'many'}})
          if(data.meta.status !== 200) {
            return this.$message.error('获取动态列表失败！')
          }

          data.data.forEach(item => {
            item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')    
          })

          this.manyTableData = data.data
        } else if(this.activeIndex === '2') {
          const {data} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'only'}})
          if(data.meta.status !== 200) {
            return this.$message.error('获取静态属性失败！')
          }
          this.onlyTableData = data.data
        }
      },
      //处理图片预览效果
      handlePreview(file) {
        //保存图片真实路径到previewPath
        this.previewPath = file.response.data.url
        //展示图片预览对话框
        this.previewVisible = true
      },
      //处理移除图片的操作
      handleRemove(file) {
        // console.log(file);
        //1.获取将要删除的图片临时路径
        const filePath = file.response.data.tmp_path
        //2.从pics数组中，找到这个图片的对应索引(名字)
        const i = this.addForm.pics.findIndex(x => x.pic===filePath)
        //3.调用数组的splice方法，把图片信息对象从pics数组中删除
        this.addForm.pics.splice(i, 1)
        // console.log(this.addForm);
      },
      //监听图片上传成功事件
      handleSuccess(response) {
        // console.log(response);
        //1.拼接得到一个图片信息对象
        const picInfo = {pic:response.data.tmp_path}
        //2.将图片信息对象push到pics数组中
        this.addForm.pics.push(picInfo)
        // console.log(this.addForm);
      },
      //添加商品
      btnAdd() {
        // console.log(this.addForm.goods_introduce);
        this.$refs.addFormRef.validate(async vali => {
          if(!vali) {
            return this.$message.error('请填写必要的表单项!')
          }
          //添加的业务逻辑
          //深拷贝this.addForm
          //因为级联选择框的双向绑定必须是数组,要保留addForm的数组形式
          const form = _.cloneDeep(this.addForm) 
          form.goods_cat = form.goods_cat.join(',')
          //处理动态参数
          this.manyTableData.forEach(item => {
            const newInfo = {
              attr_id:item.attr_id,
              attr_value:item.attr_vals.join(' ')
            }
            this.addForm.attrs.push(newInfo)
          })
          //处理静态属性
          this.onlyTableData.forEach(item => {
            const newInfo = {
              attr_id:item.attr_id,
              attr_value:item.attr_vals
            }
            this.addForm.attrs.push(newInfo)
          })
          form.attrs = this.addForm.attrs
          // console.log(form);
          //发起添加商品请求，商品名称必须是唯一的
          const {data} = await this.$http.post('goods',form)
          if(data.meta.status !== 201) {
            this.$message.error('添加商品失败!')
          }
          this.$message.success('添加商品成功!')
          //编程式路由跳转
          this.$router.push('/goods')
        })
      }
    },
    computed:{
      cateId() {
        if(this.addForm.goods_cat.length === 3) {
          return this.addForm.goods_cat[2]
        }
        return null
      }
    }
  }
</script>

<style scoped>
 .el-steps {
    margin: 15px 0;
  }
 #box >>> .el-step__title {
    font-size: 13px;
  }
  .el-cascader {
    width: 260px;
  }
  .el-checkbox {
    margin:0 10px 0 0 !important;
  }
  .priviewImg {
    width: 100%;
  }
  #box >>> .ql-editor {
    min-height: 200px;
  }
  .elButton {
    margin-top: 15px;
  }

</style>